purism/librem13v1, librem13v2, liberm15v3: Fix EC LPC I/O port

The LPC I/O ports for EC communication were not set properly,
causing ectool to fail to read the Index I/O from the EC.

The EC Index I/O is on port 0x380 and the LPC I/O port needs to be
decoded by the PCI device for it to be accessible.

Correct the value for the Librem 13v1, 13v2 and 15v3.

Change-Id: Ide1d158340eadfabbce5f70ceccddfabb4db188a
Signed-off-by: Youness Alaoui <youness.alaoui@puri.sm>
Reviewed-on: https://review.coreboot.org/25328
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
diff --git a/src/mainboard/purism/librem_skl/variants/librem13v2/devicetree.cb b/src/mainboard/purism/librem_skl/variants/librem13v2/devicetree.cb
index 1fc19a5..50e484b 100644
--- a/src/mainboard/purism/librem_skl/variants/librem13v2/devicetree.cb
+++ b/src/mainboard/purism/librem_skl/variants/librem13v2/devicetree.cb
@@ -15,9 +15,9 @@
 	register "gpe0_dw1" = "GPP_D"
 	register "gpe0_dw2" = "GPP_E"
 
-	# EC host command ranges are in 0x800-0x8ff & 0x200-0x20f
-	register "gen1_dec" = "0x00fc0801"
-	register "gen2_dec" = "0x000c0201"
+	# EC host command ranges are in 0x380-0x383 & 0x80-0x8f
+	register "gen1_dec" = "0x00000381"
+	register "gen2_dec" = "0x000c0081"
 
 	# Enable "Intel Speed Shift Technology"
 	register "speed_shift_enable" = "1"